81 lines
1.9 KiB
C
81 lines
1.9 KiB
C
/*
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* based on arch/arm/mach-kirkwood/cpuidle.c
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*
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* CPU idle support for AT91 SoC
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*
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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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*
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* The cpu idle uses wait-for-interrupt and RAM self refresh in order
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* to implement two idle states -
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* #1 wait-for-interrupt
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* #2 wait-for-interrupt and RAM self refresh
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/cpuidle.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <asm/proc-fns.h>
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#include <asm/cpuidle.h>
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#include <mach/cpu.h>
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#include "pm.h"
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#define AT91_MAX_STATES 2
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static DEFINE_PER_CPU(struct cpuidle_device, at91_cpuidle_device);
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/* Actual code that puts the SoC in different idle states */
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static int at91_enter_idle(struct cpuidle_device *dev,
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struct cpuidle_driver *drv,
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int index)
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{
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if (cpu_is_at91rm9200())
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at91rm9200_standby();
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else if (cpu_is_at91sam9g45())
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at91sam9g45_standby();
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else
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at91sam9_standby();
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return index;
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}
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static struct cpuidle_driver at91_idle_driver = {
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.name = "at91_idle",
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.owner = THIS_MODULE,
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.en_core_tk_irqen = 1,
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.states[0] = ARM_CPUIDLE_WFI_STATE,
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.states[1] = {
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.enter = at91_enter_idle,
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.exit_latency = 10,
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.target_residency = 100000,
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.flags = CPUIDLE_FLAG_TIME_VALID,
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.name = "RAM_SR",
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.desc = "WFI and DDR Self Refresh",
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},
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.state_count = AT91_MAX_STATES,
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};
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/* Initialize CPU idle by registering the idle states */
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static int at91_init_cpuidle(void)
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{
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struct cpuidle_device *device;
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device = &per_cpu(at91_cpuidle_device, smp_processor_id());
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device->state_count = AT91_MAX_STATES;
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cpuidle_register_driver(&at91_idle_driver);
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if (cpuidle_register_device(device)) {
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printk(KERN_ERR "at91_init_cpuidle: Failed registering\n");
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return -EIO;
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}
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return 0;
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}
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device_initcall(at91_init_cpuidle);
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